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Discussion Starter #1
With all these transmission threads, who here has swapped their MT82 out for the Tremec Magnum XL or T-56.

I specifically would like to know your impressions of how the taller geared Tremecs affected your 5.0's quickness factor.

Are you slower, faster or about the same?

Inquiring minds wish to know.

I searched the forum and read some threads but I'm not finding the answers I am looking for.
All I am finding is that some switched out the diff gears to 4:10 at the same time.

I am more interested in the effects of the Tremecs for quickness without swapping out the rear end gearing.
A one for one comparison would be really helpful.

Thanks.
 

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We have debated this before. if you were stock, I would say leave it alone. In your case, with what you are running, IMO I think the T-56 is the way to go. Again, just my opinion.

May I ask, with your present combination, how is your car performing ?
 

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Discussion Starter #3
I love it and all, but I am beginning to think I should have planned on needing more power.

I'm at 5,000 feet and suffer a 12% to 15% power loss here at altitude.
The SC is the same way. At sea level it pushes 9 lbs on the gauge, up here 7lbs.
I should have planned for altitude a bit more when building it.

I have the 285s and a Torsen T2 unit. Once in second, it rarely breaks loose. OK, traction is good. No wheel hop either.
The Watts Link is pretty amazing, night and day over the stock panhard thing.

The Eibachs have loosened somewhat the last 6K miles, making the ride much more bearable.
The car rides flat, whether cornering or accelerating, even braking. No more annoying hood up back down thing accelerating. Gosh I don't miss that.

I got the traction and handling correct in my build, but I need more horsepower, I can handle more horsepower.
It's that trap, ya know?

My MT82 quit whining for some odd reason and has really broken in nicely and holding up to the power. Go figure that one. My MT82 as new was awful, now it's pretty good. I switched out the stock fluid for a refill of the same.

The Centerforce Dual Disc clutch is a little noisy when the pedal is on the floor, sounds like a throw out bearing rattling, but it's the clutch, oh well, That said, the pedal effort is holding and it's no different in foot pressure than a stock clutch.

I love everything about my Mustang, but it's all really about the power, isn't it?

I need more, and apparently my appetite for it is insatiable.

But it isn't my fault, and again, it's all bout the horsepower at this point.

Maybe I cannot be happy until I breathe on the accelerator pedal and it spins the tires.
I'm hopeless, drowning in a vast sea of too little horsepower.

I really mean what I post here, sad huh.
 

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Discussion Starter #5
Are they doing the tranny swaps?

Ya know, before I had my build done, I read this forum and scoured the net to educate myself and gather ideas. It was easy to see that Mustang owners mod their cars a lot.

I thought I had learned something and had built everything I would need for the future.

Wrong. Things still feel unfinished, for lack of a better word.
 

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Discussion Starter #7
Interesting, thanks for the help. Maybe I needed to refine my search words.

Those thread seem very recent.

I guess I will wait for those guys to post their times and other observations once they are done with all those mods.

I am still worried about reducing the quickness I have now.

Hmmm, 4:10s for the diff.

My 3:73s have a bit of whine the old 3:31s did not have.
Do 4:10s whine even more?
 

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Im picking up my car from JPC in MD on Thursday. I just did the swap. Right now, they told me to try it with the 3:31's and adjust from there. Should drive more like the old Fox Body T5 with the 3:08's or 2:73's. They said some like the longer 1st gear with boost. I will likely switch to 4:10's or 3:73's in the future I am guessing.cartman.gif
 

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Discussion Starter #9
I'm definitely interested in your observations when you get it back.

I'm reading around here that if you go 4:10s you will kind of match an MT82 with 3:73s.

Best part about what you doing currently is just the transmission swap. Then we all get a good comparison of the immediate changes whether quicker or slower with that taller geared tranny.

Maybe taller with some boost will result in not as much change as I am thinking might be the case when you leave the rear end alone.
 

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Im picking up my car from JPC in MD on Thursday. I just did the swap. Right now, they told me to try it with the 3:31's and adjust from there. Should drive more like the old Fox Body T5 with the 3:08's or 2:73's. They said some like the longer 1st gear with boost. I will likely switch to 4:10's or 3:73's in the future I am guessing.cartman.gif
Your 3:31's with the tremec will be equivalent to a 2:67 rear end geared mt-82 if you want to get what you had with the mt-82 and 3:31's you need to change to 4:10's. be ready for your car to be slower for the time being!
 

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I'm definitely interested in your observations when you get it back.

I'm reading around here that if you go 4:10s you will kind of match an MT82 with 3:73s.

Best part about what you doing currently is just the transmission swap. Then we all get a good comparison of the immediate changes whether quicker or slower with that taller geared tranny.

Maybe taller with some boost will result in not as much change as I am thinking might be the case when you leave the rear end alone.
No, to match the mt-82 and 3:73's you will need to get 4:56's with the tremec!

I did all my calculations using this app, using a 27 inch tall tire!

http://xse.com/leres/bin/gearratio?title=SS+#670+with+MM6+manual+and+3.73+gears&rpm=7500&mph=80&gear1=2.97&gear2=2.10&gear3=1.46&gear4=1.00&gear5=0.80&gear6=0.63&reverse=2.90&axle=3.31&tire=diameter&diameter=27.00&circumference=84.82&revs=747&section=285&profile=35&wheel=19
 

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Discussion Starter #12
Do any of these lower rear ends whine more than the 3:73 do.

Mine don't whine super loud, but there is some especially 45MPH to 60MPH usually upon decel.

Is this just the nature of the beast?

Hey look, I'm a novice at this performance stuff. I just researched first and then had enough cash on hand to have my car built to specs.

But now I see there is so much to learn.
 

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Your 3:31's with the tremec will be equivalent to a 2:67 rear end geared mt-82 if you want to get what you had with the mt-82 and 3:31's you need to change to 4:10's. be ready for your car to be slower for the time being!
I agree I will likely change eventually. It will be cool to see how she is. I liked my old 90 notchback foxbody and never had boost in the car. I was too young and poor lol. Maybe with boost I will be pleasantly surprised. The guys at JPC said it won't be that bad.
 

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I have to chuckle sometimes. All Ive read on these forums for a while now is about how the gears in the MT82 are way too short, no first gear, first gear useless, have to start off in second etc etc etc.
Now that Tremec went ahead and offered different ratioed units to address the short first gear problem of the MT82 guys are saying get 4:56 gears, ratios are way too tall , car will slow down etc etc etc.

Isnt the internet just a conglomerate of hilarious entertainment.
By the way, other than wanting a stronger unit, I also wanted a taller first gear. That's why my car now has a
Termec in it. dance.gif
 

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Discussion Starter #15
I use 1st gear every time from standing. I don't find it useless.

Then again I am minus 12 to 15lbs with an ultra light aluminum flywheel from the weight of the stock flywheel.

I need that umph to get off the line, hence 1st is important to me, whether normal traffic situation or not.

I set up my Shelby to be more track-like and/or taking off quickly from a rolling start as opposed to a standing start drag race style. I went more for the handling and quick acceleration coming out of corners.

Randeez11,
Are you quicker, the same or slightly slower with your Tremec and 3:73s than if you had the MT82 and 3:73s and why?
I am wondering if though the Tremec is taller, maybe one could be quicker with less shifting and being in any particular gear longer, I dunno.

Hence this thread.

I have found that things are not always as they seem. That ultra light flywheel in mine causes less engine braking than when the stock flywheel was in. I would have figured the engine braking would have increased, not decreased. But most everyone that actually has a lighter flywheel agrees there is less engine braking.
That's a brain teaser to me.
 

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The numbers don't lie if I'm spending $5500 on a tranny i certainly can afford another $200 on a 4:10 ring and pinion! I happen to like the gearing of the mt-82 and 3:31's so i want to be as close to that as possible with the new tranny. The #'s say i need 4:10s to get there. To each his own, put any gear you want in and good luck with it. The tremec is 1 bad ass tranny i gotta have!
 

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This is from another thread by konastang10:
Tremec magnum xl with wide ratio 2:97 gears and 3:31's, 3:73's vs Mt-82 with 3:31 rear end gears. The final overall ratio = the combination of the tranny gears and the rear end gears. the rest is self explanatory. # 's are based on a 27 inch diameter tire!

Tremec and 3:31's

Final overall ratio. Mph @ 7500 rpm. Rpm @ 80mph

1st) 9.83 61.3 9793
2nd) 6.95 86.7 6924
3rd) 4.83 124.6 4814
4th) 3.31 182.0 3297
5th) 2.65 227.5 2638
6th) 2.09 288.8 2077

Tremec and 3:73's

1st) 11.58 52.0 11538
2nd) 8.19 73.5 8158
3rd) 5.69 105.8 5672
4th) 3.90 154.4 3885
5th) 3.12 193.1 3108
6th) 2.46 245.1 2448

Mt-82 and 3:31' s

1st) 12.11 49.7 12068
2nd) 8.04 74.9 8012
3rd) 5.59 107.7 5572
4th) 4.37 137.9 4352
5th) 3.31 182.0 3297
6th) 2.15 280.0 2143

As you can see the Tremec with 3:73's is very close to the Mt-82 with 3:31's. however the Tremec with 3:31's is way off the mark. So for those of you looking to do a Tremec swap in the near future you will need to start with a rear end gear change of a minimum of 3:73's just to get to what the mt-82 does with 3:31's! When i do my swap I'm going with 3:90's, i think that will be a prefect fit!
 

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I use 1st gear every time from standing. I don't find it useless.

Then again I am minus 12 to 15lbs with an ultra light aluminum flywheel from the weight of the stock flywheel.

I need that umph to get off the line, hence 1st is important to me, whether normal traffic situation or not.

I set up my Shelby to be more track-like and/or taking off quickly from a rolling start as opposed to a standing start drag race style. I went more for the handling and quick acceleration coming out of corners.

Randeez11,
Are you quicker, the same or slightly slower with your Tremec and 3:73s than if you had the MT82 and 3:73s and why?
I am wondering if though the Tremec is taller, maybe one could be quicker with less shifting and being in any particular gear longer, I dunno.

Hence this thread.

I have found that things are not always as they seem. That ultra light flywheel in mine causes less engine braking than when the stock flywheel was in. I would have figured the engine braking would have increased, not decreased. But most everyone that actually has a lighter flywheel agrees there is less engine braking.
That's a brain teaser to me.
I cant answer the question right now. As Ive said on other threads, I also changed my clutch and am breaking it in according to instructions from Centerforce. It is going to take me a while to get 500 easy miles on the car, especially when Im going in for knee surgery in 2 weeks.
I doubt very much that the car will indeed be slower though. I suffered horrendous wheel spin problems with the stock MT82. Anything that reduces that in any way, will be a step in the right direction for me.
 

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This is from another thread by konastang10:
Theres a typo under the tremec 3:73's 4th gear stats its not 3:90 but 3:73 because 4th gear in a tremec is 1:1, i'd correct it but i have edit option here!





Updated and corrected:




Tremec and 3:31's

Final overall ratio. Mph @ 7500 rpm. Rpm @ 80mph

1st) 9.83 61.3 9793
2nd) 6.95 86.7 6924
3rd) 4.83 124.6 4814
4th) 3.31 182.0 3297
5th) 2.65 227.5 2638
6th) 2.09 288.8 2077

Tremec and 3:73's

1st) 11.58 52.0 11538
2nd) 8.19 73.5 8158
3rd) 5.69 105.8 5672
4th) 3.73 161.5 3716
5th) 3.12 193.1 3108
6th) 2.46 245.1 2448

Mt-82 and 3:31' s

1st) 12.11 49.7 12068
2nd) 8.04 74.9 8012
3rd) 5.59 107.7 5572
4th) 4.37 137.9 4352
5th) 3.31 182.0 3297
6th) 2.15 280.0 2143
 
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